ancient architecture castle decay defence defense desuetude fort fortress Greece Greek high hilltop historical Mystras old ruins stone stronghold UNESCO World Heritage view wall window elements Golan Heights hills Israel Mivtzar Nimrod mountains Nimrod Nimrud Qal'at Namrud Remains trees valley arch blocks stairs steps homes houses village inscription letters writing capstone entrance room strong lookout sentry abandoned building clouds cloudscape conflict County crenulation culture derelict dramatic fortification grass hill historic ireland keep kerry killarney landscape masonry medieval mountain Munster nature of park provincial republic ring ruin rural sky southern tower war